The World Playoffs for League of Legends, which had been livestreaming just fine, have been called…
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Now, however, come accusations of cheating, in this thread on the game's official forums. As Massively explains it, at the match, a large screen showed the audience the action, and two smaller screens displayed each team's position. While competitors were told to face forward, viewers said they noticed players turning their heads—basically, looking at the opposing team's minimap.

The first post on in that thread on the LoL forum makes the allegations in greater detail, with screen captures of the live stream that they say show the forbidden screen-looking (above). Massively got a statement from the lead referee from the tournament:

We keep a constant watch on all the players on stage at all times. We have cameras as well as live people walking onto stage to keep tabs in everything. All players are told that they need to remain sitting, facing forward, and with headphones on at all times, including during pauses. I can personally confirm that no WE player looked at the minimap at any point during the match.